Report extra metadata

[mariomac]

From other services in the App O11y plugin, I see that they report many resource attributes that we don't, and they could be useful e.g. to differentiate between instances:

• host.name
• os.description
• os.type
• process.command_args
• process.executable.name
• process.executable.path
• process.owner
• process.pid
• process.runtime.description (e.g. go version go1.19.2 linux/amd64)
• process.runtime.name
• service.instance.id
• service.namespace
• telemetry.sdk.language
• telemetry.sdk.name
• telemetry.sdk.version

If we detect that the process runs in a container:

• container.id

If we detect that the process runs in K8s:

• k8s.node.name
• k8s.pod.name
• k8s.namespace.name

For Kubernetes, the easiest way would be to just allow setting these values via env vars, then use the valueFrom clause in the deployment descriptors.

[mariomac]

Maybe we should wait until most resource conventions move from Experimental to something more stable: https://opentelemetry.io/docs/specs/otel/resource/semantic_conventions/